| 四川盆地二叠纪栖霞—茅口期古地理格局转换及勘探启示 |
| |
| 引用本文： | 杨帅,陈安清,张玺华,李乾,徐胜林,陈聪,孙诗,李富祥,罗倩,文龙,陈洪德.四川盆地二叠纪栖霞—茅口期古地理格局转换及勘探启示[J].沉积学报,2021,39(6):1466-1477. |
| |
| 作者姓名： | 杨帅 陈安清 张玺华 李乾 徐胜林 陈聪 孙诗 李富祥 罗倩 文龙 陈洪德 |
| |
| 作者单位： | 1.油气藏地质及开发工程国家重点实验室（成都理工大学），成都 610059 |
| |
| 基金项目： | 成都理工大学珠峰科学研究计划项目2021ZF11402国家自然科学基金41872109 |
| |
| 摘 要： | 层序岩相古地理的重建工作对认识盆地的构造—沉积演化、沉积建造时空分布和油气勘探具有重要意义。特殊的构造位置和演化历史造就了四川盆地二叠纪的构造—沉积分异的复杂性。前人对四川盆地二叠纪的原始地理格局认识差异较大，一定程度上制约了栖霞—茅口组有利勘探相带的预测。在综合油气勘探地震、钻井及盆地周缘的露头剖面资料上，通过沉积旋回和层序界面的识别，将栖霞组划分为SQ1和SQ2两个三级层序，茅口组划分为SQ3—SQ5三个三级层序；基于沉积相标志和地层层序的宏观分布特征，重建了四川盆地栖霞—茅口期各层序的岩相古地理。结果表明:岩相古地理相带宏观展布揭示了盆地构造形迹由栖霞期的北东向转变为茅口期的北西向；构造—沉积格局由栖霞期准稳定背景的“隆—坳”分异向茅口期非稳定背景的“台—槽”分异转换；准稳定期的栖霞组有利勘探相带以相对平坦地貌的水下微幅隆起控制为主，呈现出“一带一环”的白云岩浅滩分布，非稳定期的茅口组则在区域张裂构造背景及同沉积正断裂活动的影响下，有利勘探相带受“一槽一半岛”的控制；栖霞—茅口期的台地边缘性质是先成浅水地貌成因的边缘，有利勘探区主要分布在边缘内侧的岸后云质浅滩相带，不同于礁滩沉积铸造的有利勘探相带为滨岸高能礁滩体的镶边台地边缘。
|
| 关 键 词： | 四川盆地 栖霞组 茅口组 层序地层学 岩相古地理 构造—沉积分异 |
| 收稿时间： | 2021-03-19 |
Paleogeographic Transition of the Permian Chihsia-Maokou Period in the Sichuan Basin and Indications for Oil-gas Exploration |
| |
| YANG Shuai,CHEN AnQing,ZHANG XiHua,LI Qian,XU ShengLin,CHEN Cong,SUN Shi,LI FuXiang,LUO Qian,WEN Long,CHEN HongDe.Paleogeographic Transition of the Permian Chihsia-Maokou Period in the Sichuan Basin and Indications for Oil-gas Exploration[J].Acta Sedimentologica Sinica,2021,39(6):1466-1477. |
| |
| Authors: | YANG Shuai CHEN AnQing ZHANG XiHua LI Qian XU ShengLin CHEN Cong SUN Shi LI FuXiang LUO Qian WEN Long CHEN HongDe |
| |
| Institution: | 1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China2.Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China3.Exploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu 610041, China |
| |
| Abstract: | The reconstruction of litho-paleogeography has an important role in understanding the evolution of sedimentary environments and the spatial distribution of sedimentary formations， and for hydrocarbon exploration. The unique location and evolution of structures caused complicated tectonic?sedimentary differentiation of the Permian in the Sichuan Basin. Previous studies have reported differences in their understanding of the original geographical pattern of the Permian in the Sichuan Basin. This has limited the prediction of favorable exploration facies belts in the Chihsia and Maokou Formations to a certain extent. In this study， the stratigraphy and sequence boundaries were interpreted from combined seismic and well log data and field data surrounding the Sichuan Basin. On this basis， the Chihsia Formation was divided into two third-order sequences， SQ1 and SQ2， and the Maokou Formation into three third-order sequences， SQ3， SQ4 and SQ5. Five paleogeographic maps were created based on the sedimentary facies evidence and characteristics of these 3rd-order sequences. These reveal that the tectonic features transitioned from the northeast of the Chihsia stage to the northwest of the Maokou stage. Tectonic-sedimentary differentiation features transition from the uplift and depression of the quasi-stable background in the Chihsia stage to platform/trough differentiation of the unstable background in the Maokou stage. The favorable exploration facies belt in the Chihsia Formation in the quasi-stable period was mainly due to the relatively flat landform， with slight uplift under water. The dolomite shoal facies is evident in a “belt and ring” structure. The unstable Maokou Formation was influenced by the regional extensional structural background and syndepositional normal fault activity. Favorable exploration facies belts occur in “trough and peninsula” structures. The platform margin between the Chihsia and Maokou periods marks the origin of shallow-water geomorphology. The favorable exploration areas are mainly in the backshore cloud shoal facies belt inside the margin. This differs from reef-sedimentary zones， where favorable exploration facies belts occur at the edge of the platform of a high-energy reef beach along the shore. |
| |
| Keywords: | |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《沉积学报》浏览原始摘要信息 |
| 点击此处可从《沉积学报》下载免费的PDF全文 |
|
